Assessing enzyme activities using stable isotope labeling and mass spectrometry

Area of Science:

• Biochemistry
• Proteomics
• Enzymology

Background:

• Activity-based protein profiling (ABPP) is crucial for studying enzyme function.
• Current ABPP methods often involve multi-step processes for identification and quantification.
• There is a need for more streamlined and sensitive techniques.

Purpose of the Study:

• To develop a highly quantitative and streamlined method for enzyme activity profiling.
• To reduce the complexity of traditional two-step ABPP procedures.
• To enhance the detection sensitivity for subtle changes in enzyme activity.

Main Methods:

• Development of a novel single-step method termed catch-and-release activity profiling of enzymes (CAPE).
• Application of CAPE to label, enrich, and quantify active enzymes from complex biological mixtures.
• Utilizing mass spectrometry for sensitive detection and quantification.

Main Results:

• The CAPE method successfully reduces the traditional two-step ABPP process to a single step.
• CAPE demonstrates high quantitative accuracy in assessing enzyme activity.
• The approach reveals the ability to detect small quantitative changes often missed by other techniques.

Conclusions:

• CAPE offers a significant advancement in activity-based protein profiling.
• This streamlined method provides a more efficient and sensitive tool for enzyme activity analysis.
• CAPE has the potential to improve the understanding of enzyme function in various biological contexts.